I've got a bit of a tricky situation here and I'm not having much luck finding a tutorial for it.

I'm creating an audiobook library manager app. I have a fairly standing 2-column NavigationView list/detail setup.

The detail view is a FlipCard view where the front of the card is the book cover and general title/author information, and the back of the card is the description/summary of the book and more obscure information (like the inside of a dust jacket or back cover of a paperback.)

So, say the user is looking at a book in the detail view. At the bottom of that detail view is a toolbar with buttons allowing the user to do things like navigate chapters or edit the book details. If the user taps the button to edit the book details, it presents a sheet that contains a tab view for general details, authors, narrators, etc.

This view has a top bar that shows in all tabs that allows the user to cancel or save their editing:

    var body: some View {
        VStack {
            topBar
            TabView(selection: $selection,
                    content:  {
                        generalTab
                            .tabItem { Text("General") }
                            .tag(Tab.general)
                        authorsTab
                            .tabItem { Text("Authors") }
                            .tag(Tab.authors)
                        narratorsTab
                            .tabItem { Text("Narrators") }
                            .tag(Tab.narrators)
                        genresTab
                            .tabItem { Text("Gebres") }
                            .tag(Tab.genres)
                        summaryTab
                            .tabItem { Text("Summary") }
                            .tag(Tab.description)
                    })
        }
    }

private var topBar: some View {
        HStack {
            Button(
                action: { cancel() },
                label: {
                    Text("Cancel")
                        .font(.title3)
                        .bold()
                })
            Spacer()
            Text(title)
            Spacer()
            Button(
                action: { save() },
                label: {
                    Text("Save")
                        .font(.title3)
                        .bold()
                })
        }.padding()
    }

(layouts aren't fine-tuned yet, I'm working on functionality for the moment.)

I want to add the ability to add/remove/re-order the authors, but I'm not in a NavigationView, I'm in a tabView that is inside a modal/sheet view. I don't think I can activate EditMode in this view, can I? (or if so, nothing I've tried so far is correct.)

How would I go about synthesizing EditMode behavior for lists inside a sheet view?

    @State private var authorEditing = EditMode.inactive
    private var authorsTab: some View {
        VStack(alignment: .leading) {
            HStack {
                Text("Authors")
                    .foregroundColor(.gray)
                    .font(.title2)
            }.padding()

            List {
                ForEach(authors) {
                    LineRowView($0)
                }
            }
            .listStyle(InsetListStyle())
            .onAppear(perform: {
                authors = book.authors
            })
        }
    }